topic Re: RW61X USART FIFOSTAT->RXTIMEOUT in Wi-Fi® + Bluetooth® + 802.15.4

RW61X USART FIFOSTAT->RXTIMEOUT

aar — Fri, 24 Jan 2025 21:59:03 GMT

Working with RW612's USART I stumble into the following problem:

I'm enabling the USART RXTIMEOUT interrupt using the SDK-provided API:

USART_EnableInterrupts(USART3, kUSART_RxTimeoutInterruptEnable);

and I'm also setting the interrupt using the provided API to configure it:

USART_CalcTimeoutConfig(timeMicroSec, &rxTimeoutCfg.prescaler, &rxTimeoutCfg.counter, CLOCK_GetFlexCommClkFreq(flexCommId)); rxTimeoutCfg.enable = true; rxTimeoutCfg.resetCounterOnEmpty = false; rxTimeoutCfg.resetCounterOnReceive = true; // Disable UART in order to configure timeout mp_uartBase->CFG &= ~USART_CFG_ENABLE_MASK; USART_SetRxTimeoutConfig(mp_uartBase, &rxTimeoutCfg); USART_EnableInterrupts(mp_uartBase, kUSART_RxTimeoutInterruptEnable); // Re-enable timeout mp_uartBase->CFG |= USART_CFG_ENABLE_MASK;

The interrupt is triggering as expected, however I'm unable to clear the interrupt.

According to RM00278 28.1.12:

However, from the fsl_usart.c driver (SDK 24.12) we have:

/* Only TXERR, RXERR fields support write. Remaining fields should be set to zero */ base->FIFOSTAT = mask & (USART_FIFOSTAT_TXERR_MASK | USART_FIFOSTAT_RXERR_MASK);

As the fsl driver wouldn't even attempt to clear write the FIFOSTAT->RXTIMEOUT timeout bit I tried to write to it directly:

// Clear the timeout interrupt mp_uartBase->FIFOSTAT |= USART_FIFOSTAT_RXTIMEOUT_MASK;

Unfortunately, this doesn't work and the interrupt is never cleared.

Could you please advise on how RXTIMEOUT interrupt is cleared?

Re: RW61X USART FIFOSTAT->RXTIMEOUT

Ricardo_Zamora — Mon, 27 Jan 2025 23:12:05 GMT

Hello,

Hope you are doing well. Let me check this internally.

Best Regards,

Ricardo

Re: RW61X USART FIFOSTAT->RXTIMEOUT

Ricardo_Zamora — Tue, 04 Feb 2025 20:37:29 GMT

Hello,

Thank you for your patience!

I was able to clear that bit using the following code on the DEMO_USART_IRQHandler from the usart_interrupt example:

Best Regards,

Ricardo

Re: RW61X USART FIFOSTAT->RXTIMEOUT

aar — Wed, 12 Feb 2025 17:54:08 GMT

Ricardo,

Could you please share all the modifications you made to the example code? I'm still unable to clear this flag.

This is how I'm enabling RXTIMEOUT:

DoEnableRxTimeout(double timeoutBytes) { const double rxTimeoutMicroSec{ std::ceil(((timeoutBytes * m_transmissionSize) / m_baud) * 1000000)}; usart_rx_timeout_config rxTimeoutCfg{}; const std::uint32_t flexCommId{GetFlexcommId(mp_uartBase)}; USART_CalcTimeoutConfig(static_cast<uint32_t>(rxTimeoutMicroSec), &rxTimeoutCfg.prescaler, &rxTimeoutCfg.counter, CLOCK_GetFlexCommClkFreq(flexCommId)); rxTimeoutCfg.enable = true; rxTimeoutCfg.resetCounterOnEmpty = false; rxTimeoutCfg.resetCounterOnReceive = true; // Disable UART to configure timeout mp_uartBase->CFG &= ~USART_CFG_ENABLE_MASK; USART_SetRxTimeoutConfig(mp_uartBase, &rxTimeoutCfg); USART_EnableInterrupts(mp_uartBase, kUSART_RxTimeoutInterruptEnable); // Re-enable UART mp_uartBase->CFG |= USART_CFG_ENABLE_MASK; }

Re: RW61X USART FIFOSTAT->RXTIMEOUT

Ricardo_Zamora — Thu, 13 Feb 2025 21:01:14 GMT

Hello,

I just configured the timeout:

Regards,

Ricardo